Is Lync 2010 compatible with other video systems?

It all seems very simple. You have a web camera on your computer and a video button inside your Lync app. Shouldn’t it just work? Shouldn’t you just be able to make a video call to a Cisco, Polycom, LifeSize or Vidyo system? But Microsoft Lync2010 doesn’t support video calling to other video systems and what does this mean for a user? There are options for what a user can to do to make Lync2010 support video conferencing.